Pakistani security personnel cordon off the area around a bomb blast site in Peshawar on September 3, 2012. The US embassy in Islamabad denied reports that two Americans had been killed in a suicide car bomb attack in Pakistan's northwestern city of Peshawar. A Pakistan intelligence official confirmed the US consulate car was the target, with another saying a suicide bomber ploughed his vehicle into it. AFP PHOTO/A MAJEEDA Majeed/AFP/GettyImages

Photo: A Majeed, AFP/Getty Images

Pakistani security personnel cordon off the area around a bomb...

Pakistani security personnel cordon off the area around a bomb... Photo-3404224.48427 - SFGate

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Pakistani officials and rescue workers gather at the site of bombing in Peshawar, Pakistan on Monday, Sept. 3, 2012. A suicide bomber rammed a car filled with explosives into a U.S. government vehicle in northwestern Pakistan on Monday, killing two Pakistanis and wounding 19 others, including two Americans, officials said. (AP Photo/Mohammad Sajjad)

Photo: Mohammad Sajjad, Associated Press

Pakistani officials and rescue workers gather at the site of...

Pakistani officials and rescue workers gather at the site of... Photo-3404233.48427 - SFGate

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Pakistani officials and rescue workers gather at the site of bombing in Peshawar, Pakistan on Monday, Sept. 3, 2012. A suicide bomber rammed a car filled with explosives into a U.S. government vehicle in northwestern Pakistan on Monday, killing two Pakistanis and wounding 19 others, including two Americans, officials said. (AP Photo/Mohammad Sajjad)

Photo: Mohammad Sajjad, Associated Press

Pakistani officials and rescue workers gather at the site of...

Pakistani officials and rescue workers gather at the site of... Photo-3404231.48427 - SFGate

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EDITORS NOTE: Passport photo identity has been pixelated due to security concerns
A Pakistani rescuer member holds up a burnt US passport found at a bomb blast site in Peshawar on September 3, 2012. A suicide car bomber targeted a US consulate vehicle in Pakistan, in an attack officials said killed four, but there were conflicting accounts of whether US nationals were among the dead. AFP PHOTO/A MAJEEDA Majeed/AFP/GettyImages

Pakistani policemen collect evidence at a bomb blast site in Peshawar on September 3, 2012. The US embassy in Islamabad denied reports that two Americans had been killed in a suicide car bomb attack in Pakistan's northwestern city of Peshawar. A Pakistan intelligence official confirmed the US consulate car was the target, with another saying a suicide bomber ploughed his vehicle into it. AFP PHOTO/ A MAJEEDA Majeed/AFP/GettyImages

Pakistani rescuers and security personnel gather at a bomb blast site in Peshawar on September 3, 2012. The US embassy in Islamabad denied reports that two Americans had been killed in a suicide car bomb attack in Pakistan's northwestern city of Peshawar. A Pakistan intelligence official confirmed the US consulate car was the target, with another saying a suicide bomber ploughed his vehicle into it. AFP PHOTO/A MAJEEDA Majeed/AFP/GettyImages

Pakistani rescuers inspect the badly damaged US consulate vehicle at a bomb blast site in Peshawar on September 3, 2012. The US embassy in Islamabad denied reports that two Americans had been killed in a suicide car bomb attack in Pakistan's northwestern city of Peshawar. A Pakistan intelligence official confirmed the US consulate car was the target, with another saying a suicide bomber ploughed his vehicle into it. AFP PHOTO/A MAJEEDA Majeed/AFP/GettyImages

A Pakistan rescue worker looks at a vehicle targeted by terrorists in Peshawar, Pakistan on Monday, Sept. 3, 2012. A suicide bomber rammed a car filled with explosives into a U.S. government vehicle in northwestern Pakistan on Monday, killing two Pakistanis and wounding 19 others, including two Americans, officials said. (AP Photo/Mohammad Sajjad)

Officials and rescue volunteers gather at the bombing site in Peshawar, Pakistan on Monday, Sept. 3, 2012. A car filled with explosives rammed into a U.S. government vehicle on Monday, killing a number of Pakistanis and wounding over a dozen others, police said. (AP Photo/Mohammad Sajjad)

Photo: Mohammad Sajjad, Associated Press

Officials and rescue volunteers gather at the bombing site in...

Officials and rescue volunteers gather at the bombing site in... Photo-3404225.48427 - SFGate

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A Pakistani volunteer shows a number plate of the U.S. embassy vehicle hit by a blast in Peshawar, Pakistan on Monday, Sept. 3, 2012. A suicide bomber rammed a car filled with explosives into a U.S. government vehicle in northwestern Pakistan on Monday, killing two Pakistanis and wounding 19 others, including two Americans, officials said. (AP Photo/Mohammad Sajjad)

Photo: Mohammad Sajjad, Associated Press

A Pakistani volunteer shows a number plate of the U.S. embassy...

A Pakistani volunteer shows a number plate of the U.S. embassy... Photo-3404226.48427 - SFGate